Measurement of the double-β decay half-life of 136Xe with the KamLAND-Zen experiment
Abstract
We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of 136Xe. The measured two-neutrino double-beta decay half-life of 136Xe is T1/22ν=2.38±0.02(stat)±0.14(syst)×1021 yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life, T1/20ν>5.7×1024 yr at 90% confidence level (C. L.), which corresponds to almost a fivefold improvement over previous limits.
- Publication:
-
Physical Review C
- Pub Date:
- April 2012
- DOI:
- arXiv:
- arXiv:1201.4664
- Bibcode:
- 2012PhRvC..85d5504G
- Keywords:
-
- 23.40.-s;
- 21.10.Tg;
- 14.60.Pq;
- 27.60.+j;
- Beta decay;
- double beta decay;
- electron and muon capture;
- Lifetimes;
- Neutrino mass and mixing;
- 90<
- =A<
- =149;
- High Energy Physics - Experiment;
- Nuclear Experiment
- E-Print:
- 6 pages, 4 figures. Version as published in PRC